212 



ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



Table 3 — Average Yearly Records Showing Influence of Feed and Man- 

 agement and the Use of Pure Bred Dairy Sires on Production 



O 



Average Yearly Records 



g.5 



Ms ^ 



m 



Per cent Increase 

 over Lot 1 





5 ss 



V M, 



3 p 



1. Original 

 scrubs .... 7 



2. Developed 

 scrubs .... 7 



3. Holstein x 

 scrubs .... 4 



4. Guernsey X 

 scrubs .... 4 



5. Jersey X 

 scrubs .... 1 



29 3397.1 161.67 4.76 



25 3841.2 181.64 4.73 



12 5561.6 227.94 4.10 



8 3787.6 170.56 4.50 



2 3643.1 199.64 5.48 



283 











276 



13 



12 



-1 



-2 



326 



64 



41 



--14 



15 



287 



12 



6 



-5 



1 



317 



7 



24 



15 



12 



between dams and daughters in this case as but one record made 

 by a scrub daughter of one of the old cows is available. The 

 first generation of Holstein grades show an increase of 64% 

 in amount of milk, 41% in pounds of fat, 15% in length ot 

 milking period and a decrease of 14% in per cent of fat in milk. 



The first generation Guernsey grades show an increase of 

 12% in quantity of milk, 6% in pounds of fat, 1% in length 

 of lactation period and a decrease of 5% in per cent of fat in 

 milk. The smaller increase shown by these grades cannot be 

 charged to the breed of the sire but to the fact that no mature 

 records are available and further that before the college owned 

 a herd of Guernseys a bull was borrowed and his daughters, 

 while not mature, have not equalled their dams' records, while 

 a two-year-old grade by our present Guernsey herd bull has 

 produced over 101% more milk and 107% more butterfat than 

 her scrub dam, developed here at the station, produced in her 

 best year. 



Only one first generation Jersey grade has freshened and 

 her two lactation periods show an increase of 7% in quantity of 

 milk, 24% in pounds of fat, 15% in per cent of fat and 12% in 

 length of milking period as compared to group of original 

 scrubs. 



